Answer:
3.5
Step-by-step explanation:
If AM=5, then so is MC because the angles are equal.
So AC must be 5+5 = 10.
If BD=17, you can subtract AC=10, so you keep 7 for BA + CD.
Since these angles are also equal, you can divide 7 evenly so you get:
BA = CD = 7/2 = 3.5
